TPF-C Technology Plan - Exoplanet Exploration Program - NASA

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Chapter 7 Figure 7-1. TPF-C Technology Development Roadmap (continued) 104
Plan for Technology Development Top-Level Phase A Technology Development Activities: For Phase A, the pre-Phase A testbeds (HCIT, Mask Characterization, Dilatometer, micro-slip, and scatterometer) continue to be utilized. In addition, the TDM is fabricated and tested. A laser frequency stability testbed and a precision hexapod testbed are developed. A protoflight primary mirror and mount may be initiated during this period. The protoflight mirror (PFM) will be specified to enable flight qualification. The microslip characterization facility is extended to accommodate testing of hinge and latch component microdynamics. Pointing control and subscale thermal shroud testbeds are initiated. Deployment of the sunshade is demonstrated. An effort focused on large-amplitude wavefront actuators is initiated if an actuated PM has been selected. Instrument technology developments are defined and initiated. Top-Level Phase B Technology Development Activities for the Terrestrial Planet Finder Coronagraph: As Phase B begins, the work on the dilatometer, the TDM, transmissive optics, micro-slip, mask characterization, and instrument technology has been completed. The HCIT continues to demonstrate masks and deformable mirrors. The laser frequency stability testbed flows into the closed-loop position control testbed. The work on a hinge and latch testbed and the pointing control testbed continues. A thermal shroud will be tested for isolation at a sub-scale level in an overdriven condition and at close-to-flight levels. A sub-scale EM isothermal cavity control system testbed will be developed and extended later through the installation of a sub-scale primary for a full-assembly thermal-stability test. If the project has initiated the development of a protoflight mirror in Phase A, it is expected to be under development though probably not complete by the end of Phase B. The PFM is expected to be qualified for flight in Phase C, thus becoming the TPF-C flight mirror. An EM secondary mirror will be fabricated. 7.2 Pre-Phase A Milestones 7.2.1 Milestone 1: Starlight Suppression on the HCIT Planned Completion Date: Q3 FY05 Milestone #1 will demonstrate technology for Earth-like planet detection by coronagraphic starlight suppression to a level within an order of magnitude of the required TPF-C contrast at the required angle necessary to distinguish a planet signal from its star. The HCIT has achieved 0.9 × 10 -9 average contrast over an area ranging from 4 to 10λ/D, using a laser source (λ=785 nm). Contrast stability is on the order of 0.5 × 10 -10 per hour. In near-term experiments, emphasis will be placed on speckles near 4λ/D, to demonstrate that performance is not near a fundamental limit at those angles. This will complete the milestone. Monochromatic performance will benefit from the following planned improvements: • Installation of a 64 × 64 DM, which should improve the contrast by up to a factor of two. • Improved thermal stability of the testbed components, which will reduce the impact of thermal drift over the timescale of an experiment. The dominant contributor may be the DM, whose temperature variation is a factor of 10 larger than what was seen when testing DMs in a different vacuum chamber. (Actuator gain is a strong function of temperature.) 105
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JPL Publication 05-8 Technology Pla
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TECHNOLOGY PLAN TERRESTRIAL PLANET
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Recent Highlights Technical progres
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Figure i-4. Deformable mirror deliv
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Table of Contents Approvals........
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7.5.2 Precision Hexapod............
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Chapter 1 Figure 1-1. Artist's impr
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Chapter 1 interferometry, continues
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Chapter 1 Back end coronagraph opti
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Chapter 1 Surrounding the whole tel
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Chapter 1 Pol. BS fold/steering Mic
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Chapter 1 1.6.5 Sunshield The teles
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Chapter 1 expected architecture dow
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Chapter 1 Table 1-3. TPF-C Technolo
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Chapter 1 3B: Demonstrate, using th
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Chapter 2 2 Error Budgets 2.1 Contr
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Chapter 2 Error Budget Validation G
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Chapter 2 Further, it is shown that
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Chapter 2 Table 2-1. Requirement on
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Chapter 3 3 Optics and Starlight Su
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Chapter 3 are in progress with cont
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Chapter 3 Figure 3-5. Coronagraph s
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Chapter 3 (though not light-weight
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Chapter 3 Table 3-3. ITT Metrology
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Chapter 3 observations. The time it
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Chapter 3 vacuum-compatible, low-po
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Chapter 3 blank size. Westerhoff et
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Chapter 3 configurations, performan
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Chapter 3 Figure 3-10: Plots showin
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Chapter 3 The wavefront quality of
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Chapter 3 Figure 3-13. Optical layo
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Chapter 3 algorithms have limitatio
Page 66 and 67: Chapter 3 simulated star source is
Page 68 and 69: Chapter 4 Figure 4-1. Overview of t
Page 70 and 71: Chapter 4 enclosures, and stable la
Page 72 and 73: Chapter 4 facilities from which dat
Page 74 and 75: Chapter 4 Figure 4-5. Microslip Tri
Page 76 and 77: Chapter 4 Figure 4-7. Calibration o
Page 78 and 79: Chapter 4 Figure 4-8. Comparison of
Page 80 and 81: Chapter 4 4.2 Subsystem and System
Page 82 and 83: Chapter 4 Figure 4-11. Schematic of
Page 84 and 85: Chapter 4 Figure 4-12. Fine guiding
Page 86 and 87: Chapter 4 (5) The Fine Steering Mir
Page 88 and 89: Chapter 4 Third, precise thermal co
Page 90 and 91: Chapter 4 giving confidence that fl
Page 92 and 93: Chapter 4 surface polish is nonethe
Page 94 and 95: Chapter 5 TPF-C is planning a suite
Page 96 and 97: Chapter 5 engineering judgment (i.e
Page 98 and 99: Chapter 5 categories, in reality ea
Page 100 and 101: Chapter 5 Table 5-3. Validation of
Page 102 and 103: Chapter 5 5.6.1 Modeling Methodolog
Page 104 and 105: Chapter 5 strength of computer simu
Page 106 and 107: Chapter 6 6 Instrument Technology a
Page 108 and 109: Chapter 6 Figure 6-1. Detailed conc
Page 110 and 111: Chapter 6 The first method is self-
Page 112 and 113: Chapter 6 super computers and is us
Page 114 and 115: Chapter 7 7 Plan for Technology Dev
Page 118 and 119: Chapter 7 Improvements to the DM ov
Page 120 and 121: Chapter 7 7.3 Error Budgets 7.3.1 D
Page 122 and 123: Chapter 7 7.4 Optics and Starlight
Page 124 and 125: Chapter 7 7.4.2 Apodizing Masks and
Page 126 and 127: Chapter 7 7.4.4 Wavefront Sensing a
Page 128 and 129: Chapter 7 7.4.6 Transmissive Optics
Page 130 and 131: Chapter 7 7.4.8 Scatterometer Scope
Page 132 and 133: Chapter 7 7.5 Structural, Thermal,
Page 134 and 135: Chapter 7 7.5.3 Precision Structura
Page 136 and 137: Chapter 7 model of TPF-C and should
Page 138 and 139: Chapter 7 7.5.6 Secondary Mirror To
Page 140 and 141: Chapter 7 7.5.8 Sub-scale EM Sunshi
Page 142 and 143: Chapter 7 7.6 Integrated Modeling a
Page 144 and 145: Chapter 7 7.7.3 Advanced Concepts:
Page 146 and 147: Chapter 8 134
Page 148 and 149: Appendices Appendix B: TPF-C Detail
Page 150 and 151: Appendices Appendix D: TPF-C Techno
Page 152 and 153: Appendices Appendix F: Acronym List
Page 154: Appendices RWA SAO SBIR SIM SM SMFA
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TPF-C Technology Plan - Exoplanet Exploration Program - NASA

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